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Cohesion

Backbonding a...

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Backbonding and it's effects on bond energy, bond length, etc.

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Q. Bond energies can be obtained by using the following relation:

Δ H

= \sum

Bond energy of bonds, broken in the reactants

- \sum

Bond energy of bonds, formed in the products

Bond energy depends on three factors:
a. greater is the bond length, lesser is the bond energy
b. bond energy increases with the bond multiplicity
c. bond energy increases with the electronegativity difference between the bonding atoms.

N - H

O - H

F - H

bonds in the decreasing order of bond energy:

Q. Bond energies can be obtained by using the following relation:

Δ H (r e a c t i o n) = \sum

Bond energy of bonds, broken in the reactants

- \sum

Bond energy of bonds, formed in the products
Bond energy depends on three factors:
a. greater is the bond length, lesser is the bond energy
b. bond energy increases with the bond multiplicity
c. bond energy increases with the electronegativity difference between the bonding atoms.The heat of formation of

N O

from its elements is

+ 90 k J m o l^{- 1}

, What is the approximate bond dissociation energy of the bond in

N O

?

B E_{N \equiv N} = 941 k J m o l^{- 1}

B E_{O = O} = 499 k J m o l^{- 1}

Q. Bond energies can be obtained by using the following relation:

Δ H (r e a c t i o n) = \sum

Bond energy of bonds, broken in the reactants

- \sum

Bond energy of bonds, formed in the products.

Bond energy depends on three factors:

a. greater is the bond length, lesser is the bond energy
b. bond energy increases with the bond multiplicity
c. bond energy increases with the electronegativity difference between the bonding atoms. Which among the following sequences is correct about the bond energy of

C - C

C = C

C \equiv C

Q. What is the effect of lone pair on bond length?

Q. Taking into account of hybridization and resonance effect, rank the following bonds in order of decreasing bond length.

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